"If it take Meek Mill to draw this attention, we gonna use Meek Mill to draw this attention, but it's gonna speak for so many others," Ross said during the event.

At one point during the rally, fans sang the intro to Mill's debut album, Dreams and Nightmares.

Philly came out to support Meek Mill at the #FreeMeekMill rally! Here's a clip of them doing the #DreamsAndNightmares intro.Do you stand with the cause? pic.twitter.com/OAs7yjEF8S- HipHopDX (@HipHopDX) November 13, 2017

Mill, who was on probation for a 2008 gun charge for which he already served two years in prison, was sentenced to two to four more years in prison after Judge Genece E. Brinkley found he violated his probation after two arrests earlier this year on misdemeanor charges, which were later dropped.

But Mill's attorney, Joe Tacopina, accused Brinkley of having a "personal vendetta" against Mill after the rapper refused to grant her personal requests, including dropping his label to sign with a friend of hers and mentioning her name in a song.

Tacopina pointed out that both the prosecutor and Mill's probation officer did not recommend prison time for Mill.

The New York Post reported Monday that the FBI is investigating Brinkley.

Mill's sentence has sparked a debate on criminal justice, with many of the Philadelphia-born supporters arguing the sentence is a reminder that many Americans, in particular black men, receive unfair sentences.

Meanwhile, Mill has had the support of many other celebrities, including Jay-Z, who said the sentence was "unjust and heavy handed" and fellow Philadelphian Kevin Hart, who posted an Instagram video Saturday urging people to sign a petition asking for a re-assessment of Mill's sentence.

Please go to justice4meek.com & sign the petition to help get this unfair sentencing reviewed immediately #FreeMeekMill A post shared by Kevin Hart (@kevinhart4real) on Nov 11, 2017 at 11:50am PST